The secret lives of solar flares
One hundred and fifty two years ago, a man in England named Richard Carrington discovered solar flares.
It happened at 11:18 AM on the cloudless morning of Thursday, September 1st, 1859. Just as usual on every sunny day, the 33-year-old solar astronomer was busy in his private observatory, projecting an image of the sun onto a screen and sketching what he saw. On that particular morning, he traced the outlines of an enormous group of sunspots. Suddenly, before his eyes, two brilliant beads of white light appeared over the sunspots; they were so bright he could barely stand to look at the screen.
Carrington cried out, but by the time a witness arrived minutes later, the first solar flare anyone had ever seen was fading away.
It would not be the last. Since then, astronomers have recorded thousands of strong flares using instruments ranging from the simplest telescopes in backyard observatories to the most complex spectrometers on advanced spacecraft. Possibly no other phenomenon in astronomy has been studied as much.
After all that scrutiny, you might suppose that everything about solar flares would be known. Far from it. Researchers recently announced that solar flares have been keeping a secret.
鈥淲e鈥檝e just learned that some flares are many times stronger than previously thought,鈥� says University of Colorado physicist Tom Woods who led the research team. 鈥淪olar flares were already the biggest explosions in the solar system鈥攁nd this discovery makes them even bigger.鈥�
NASA鈥檚 Solar Dynamics Observatory (SDO), launched in February 2010, made the finding: About 1 in 7 flares experience an 鈥渁ftershock.鈥� About ninety minutes after the flare dies down, it springs to life again, producing an extra surge of extreme ultraviolet radiation.
鈥淲e call it the 鈥榣ate phase flare,鈥欌�� says Woods. 鈥淭he energy in the late phase can exceed the energy of the primary flare by as much as a factor of four.鈥�
What causes the late phase? Solar flares happen when the magnetic fields of sunspots erupt鈥攁 process called 鈥渕agnetic reconnection.鈥� The late phase is thought to result when some of the sunspot鈥檚 magnetic loops re-form. A prepared by team member Rachel Hock of the University of Colorado shows how it works.
The extra energy from the late phase can have a big effect on Earth. Extreme ultraviolet wavelengths are particularly good at heating and ionizing Earth鈥檚 upper atmosphere. When our planet鈥檚 atmosphere is heated by extreme UV radiation, it puffs up, accelerating the decay of low-orbiting satellites. Furthermore, the ionizing action of extreme UV can bend radio signals and disrupt the normal operation of GPS.
SDO was able to make the discovery because of its unique ability to monitor the sun鈥檚 extreme UV output in high resolution nearly 24 hours a day, 7 days a week. With that kind of scrutiny, it鈥檚 tough to keep a secret--even one as old as this.
The of Woods et al may be found in the Oct. 1, 2011, issue of the Astrophysical Journal.
Provided by Science@NASA
